メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.6625000 26.2208334, 127.6687500 26.2208334, 127.6687500 26.2250000, 127.6625000 26.2250000, 127.6625000 26.2208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral